Sectional gear



W BRINTON.

SECTIONAL GEAR.

APPLICATION FILED MAR. 21. 19I9.

1,30,16, Patented July1,1919.

TTORNEYS UNITED STATES PATENT OFFICE.

WALTER BRINTON, OF WI LMINGTON, DELAWARE, ASSIGNOR T0 AMERICAN MANGANESESTEEL COMPANY, OF AUGUSTA, MAINE, A CORPORATION OF MAINE.

SECTION AL GEAR.

To all whom it may concern:

Be it lmown that I, WALTER BRINTON, a citizen of the United States, anda resident of Wilmington, in the county of New Castle and State ofDelaware, have made and invented certain new and useful Improvements inSectional Gears, of which the following is a specification.

'My invention relates to sectional gears designed especially for use inheavy and severe service such, for example, as is met with in rollingmill work wherein the roll trains are driven by gears made in accordancewith myinvention; and particularly to gears wherein the teeth are formedupon a sleeve of tough wear-resisting material such, for example, ascast manganese steel; and which sleeve is then placed upon and securedto a hub, center orshaft suitable for the use to which the complete gearis to be put, and secured thereto. This method of construction providesin efiect a single unitary structure, while at the same time enablingthe teeth and sleeve to be made of one material, and the shaft or hub ofanother, should it be deemed desirable to do so.

More particularly, my invention relates to the manufacture of large-sizegear or mill pinions measuring up to four to five feet in diameter andformed of cast manganese steel, which material, it has been found inpractice, will most successfully withstand the wear and shocks to whichpinions are necessarily exposed.

Heretofore it has vbeen found that mill pinions of large size which areformed of cast manganese steel have portions thereof which are brittle,and further, that the strains and stresses set up during the shrinkageof the metal cannot be entirely eliminated, due to the excessive size ofthe cast- In S- %t[anganese"steel in the cast stateis composedprincipally of austenite and free cementite, the austenite being thedesired solution of iron and manganese, and the cementite occurring asan impurity or undesirable ingredient made up of the carbids of iron andundissolved manganese. The occurrence of cementite in,..a castingrenders Specification of Letters Patent.

manufacture of the finished Patented July 1, 1919.

Application filed March 21, 1919. Serial No. 284,167.

the same brittle and. unsound and must be.

eliminated by heat treatment in order for the casting to embody therequired strength and toughness. 1

The failure of large-size mill pinions which have been formed of castmanganese steel, in the past, has been largely due to the presence ofcementite, the casting being of a it may be formed of cast manganesesteel, the design being such that each and every part of the gear may berapidly quenched during the heat treatment and the formation ofcementite avoided.

With this and other objects in view, I have provided a gear or millpinion which is formed of a hub upon which are assembled annularsections composed of cast'manganese steel and the teeth of each sectionbeing provided with inwardly projecting cavities, so that the teeth inparticular may be entirely free of the injurious cementite.

A further object of my invention is to provide for the more convenientmanufacture of sectional gearing made up of annular gears as aforesaid,such end being attained by providing the sections with perforated lugsor ears through which bolts may extend, and whereby all the sectionsnecessary to form a finished gear may be secured together preparatory togrinding the interiors of the sections and the keyways for securing themto the hub or shaft whereby theyare carried at one and the same grindingoperation, thereby securing uniformity of size in the holes in theseveral individual gear sections through which the shaft referred toextends and materially reducing the cost of gear made up of the sectionsas aforesaid. j

WVith the above-and other objects in View, my invention consistsin theimprovedseetional gear illustrated in the accompanying drawing andhereinafter described and articularly claimed, and in such variatlons toprovide a gear of such construction that and modifications thereof aswill be obvious to those skilled in the art to which my in ventionrelates.

In the drawing accompanying and forming a part of this specification andwherein the preferred embodiment of my invention is illustrated:

Figure 1 is a perspective view showing a gear made in accordance with mylHYGIIUOII;

Fig. 2 is a view showing a section upon a longitudinal central plane ofthe gear sections, the end rings of the gear, and the shaft orhub inpart; the position of the plane being indicated by the line 2 2, Fig. 3;

Fig. 3 is a view showing a section upon a transverse plane indicated bythe line 3, 3,

Fig. 2; and

'Fig. 4 is a perspective view showing a section from which the gear as awhole is .formed by itself, and with the ears or lugs whereby severalsections may be secured together to thereby secure uniformity ingrinding the opening for the shaft or hub to which they are to besecured.

Referring now to the drawing, the reference numeral 5 designates a hubor shaft the central portion 6 of which is shown as slightly enlarged,and to which enlarged portion a plurality 'of separate annular toothedgear sections designated each by thereof; the side faces of each twosuccessive gear sections being in contact one with another, and theteeth 8 of all the sections being in alinement, as best shown in Fig. 1of the drawing. In the'embodiment "of my invention illustrated the sev--eral sections of the assembled gear are secured in proper positionrelative to one another by two keys 9, 1O lying within key ways providedin the enlarged central por tion 6 of the shaft and in the several gearsections, although the manner of holding the gear sections in properposition is of secondary importance herein, as this present invention inno way relates to the structure of securing means for preventing therotation of the gear sections upontthe shaft whereby they are supported.End rings such asa're designated by the reference numeral 11 arepreferably placed one at each end of the gear made up of the severalseparate sections as herein explained to thereby secure a more desirablegear-and to provide shroudings at the ends thereof, although the use ofsuch end rings may be dispensed with without affecting thedistinguishing features enumerated in the coneluding claims, and whereinmy invention consists, should it be deemed desirable to do so.

The gear sections 7 are -made. -of cast. manganese steel, this materialbeing extreniely strong and tough and having wearresisting qualitiesespecially adapting it for use in the manufacture of gears for rollinmills, where excessive strains and fiuctuat ing loads are of frequentoccurrence.

The sections 7 are provided with recesses the teeth project. The thusforming of the gear with a separate hub and mounting thereon a pluralityof cast manganese steel sections, the design of which section being suchthat the occurrence of cementite therein is entirely eliminated,provides a gear which is especially able to withstand high and excessivestrains and hard service. In order that the various sections 7 may beproperly alined and the teeth ground with out disturbing the alinement,I have provided the gear sections with projecting ears or lugs, asillustrated in Fig. 4, through which bolts may extend. After the teethhave been properly ground, thelugs are removed. the reference numeral 7are secured so as to rotate with the shaft but not independent Havingthus described and explained my invention, I claim and desire to secureby Letters Patent: 1

1. A gear composed of a plurality of transversely arranged sectionsformed of cast manganese steel, each section including a continuousring-like body having teeth projecting therefrom, said teeth providedwith recesses extending inwardly fromthe side walls-thereof.

' 2. A gear section formed of cast manganese steel with a ring-like bodyhaving teeth projecting therefrom,.said teeth pro vided with recessesextending inwardly from the side walls thereof, the ring-like portion ofthe section being also provided with recesses extending inwardly fromthe side walls thereof.

3. A gear section formed with a ring-like body having teeth projectingtherefrom, the said teeth rovided with recesses extending inwardly romtheside walls thereof, the walls of said recesses extendingsubstantially parallel to the adjacent walls of the teeth, the ring-likeportion of the section being also provided with recesses approxt matingthe form of. the adjacent walls of the particular portion of the sectionin which the said recesses are located.

4., An annular gear section having a series of circumferentiallyarranged teeth; and a plurality of perforated lugs or ears carried bysaid sect-ion whereby a plurality of sections may be secured togetherfor grinding.

5. An annular gear section having a New Castle and State of Delaware,this 19th "series of circumferentially arranged teeth; day of March, A.D. 1919.

and a plurality of perforated lugs or ears carried by said teeth wherebya plurality WALTER BRINTON 5 of sections may be secured together forWitnesses: 11E grinding. v v M. G. LANDERs,

Signed at New Castle, in the connty of G. T. COMLY.

